Context is very important when reading the scriptures and we cannot ringfence one portion of the scriptures and provide an interpretation of that ringfenced portion of the scriptures without considering the whole of the scriptures to come to the right understanding.
If then, we are a person in whom the light has filled our life with Christ's glory, then whenever an opportunity comes a knocking to us, we should share the light within us when that opportunity comes our way.
Sadly, we often fall short of what we claim is within us because we hold onto grievances with other people or consider that our "knowledge/understanding is far superior to theirs and as such we need to correct their knowledge/understanding to conform to ours.
If there is no forgiveness in our heart for others who have/might have offended us, then the light is not within us, and our saltiness has gone astray, and the light is no longer within us, and we also stumble.
If a brother among the Saints has stumbled, then we should pray for that brother in Christ, that God will continue to draw that brother to Himself so that the stumble becomes of no consequence for him if he will repent his sin to God.
Yes, we are told that when a brother stumbles that we should approach him in love gently to help him back to God's pathway to salvation. But so often our approach is to lord it over our brother and commit the sins that God has told us not to commit.
The primary sin that we commit in this situation is that we begin to act God like towards our fallen brother, rather than to simply commit our concerns for the brother to God to deal with.
Because we commit this primary sin and we lose God's moral compass for our lives, we will experience the manifestation of other secondary sins that if we consider them, indicates to us that we have also turned from God and also need redemption.
Much wisdom is needed to be able to follow God's leading in all that we do while worshipping God with our life.
Shalom